Islam, Nahidul2024-07-012024-07-012024-02http://dspace.iiuc.ac.bd/handle/123456789/8263This internship report is submitted in partial fulfillment of the requirements for the degree of Bachelor of Science in B.Sc. Engineering Cataloged from the PDF version of the internship report.This study proposes a metamaterial absorber (MMA) based on rotational symmetry to design a wide-angle, polarization-insensitive wireless system for S, C, X, and Ku bands. The MMA comprises electric ring resonators (ERR) arranged in a single layer with four-fold interconnected rotational symmetry, fabricated using FR-4 substrate. In the frequency range of 4 to 18 GHz, the MMA shows five distinct absorption peaks. Notably, absorption levels at 4.882 GHz, 6.464 GHz, 7.882 GHz, 11.3 GHz, and 17.216 GHz reach 99.3%, 94.9%, 94.5%, 98.7%, and 92.5%, respectively. The compact unit cell, with dimensions of 0.162λ×0.162λ×0.026λ at 4.882 GHz, achieves 99% mean absorptivity. Furthermore, the MMA exhibits stable absorption characteristics across azimuth and elevation angles (phi= 0 to 90 degrees, Theta = 0 to 60 degrees). Resonances demonstrate near-zero or negative refractive index traits, offering tunable multifunctionality. The MMA's compactness, high effective medium ratio (EMR), negative permittivity, permeability, and near-zero refractive index make it suitable for various wireless applications, enhancing gain and antenna directivity in fixed-mobile and multiband scenarios.enThesis